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/*
* Copyright 2021 - 2022 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.BitSet;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
public class NavtelecomProtocolDecoder extends BaseProtocolDecoder {
public NavtelecomProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final Map<Integer, Integer> ITEM_LENGTH_MAP = new HashMap<>();
static {
int[] l1 = {
4, 5, 6, 7, 8, 29, 30, 31, 32, 45, 46, 47, 48, 49, 50, 51, 52, 56, 63, 64, 65, 69, 72, 78, 79, 80, 81,
82, 83, 98, 99, 101, 104, 118, 122, 123, 124, 125, 126, 139, 140, 144, 145, 167, 168, 169, 170, 199,
202, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222
};
int[] l2 = {
2, 14, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 35, 36, 38, 39, 40, 41, 42, 43, 44, 53, 55, 58,
59, 60, 61, 62, 66, 68, 71, 75, 100, 106, 108, 110, 111, 112, 113, 114, 115, 116, 117, 119, 120, 121,
133, 134, 135, 136, 137, 138, 141, 143, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 171, 175, 177, 178, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
190, 191, 192, 200, 201, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237
};
int[] l3 = {
84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 142, 146, 198
};
int[] l4 = {
1, 3, 9, 10, 11, 12, 13, 15, 16, 33, 34, 37, 54, 57, 67, 74, 76, 102, 103, 105, 127, 128, 129, 130, 131,
132, 172, 173, 174, 176, 179, 193, 194, 195, 196, 203, 205, 206, 238, 239, 240, 241, 242, 243, 244, 245,
246, 247, 248, 249, 250, 251, 252
};
for (int i : l1) {
ITEM_LENGTH_MAP.put(i, 1);
}
for (int i : l2) {
ITEM_LENGTH_MAP.put(i, 2);
}
for (int i : l3) {
ITEM_LENGTH_MAP.put(i, 3);
}
for (int i : l4) {
ITEM_LENGTH_MAP.put(i, 4);
}
ITEM_LENGTH_MAP.put(70, 8);
ITEM_LENGTH_MAP.put(73, 16);
ITEM_LENGTH_MAP.put(77, 37);
ITEM_LENGTH_MAP.put(94, 6);
ITEM_LENGTH_MAP.put(95, 12);
ITEM_LENGTH_MAP.put(96, 24);
ITEM_LENGTH_MAP.put(97, 48);
ITEM_LENGTH_MAP.put(107, 6);
ITEM_LENGTH_MAP.put(109, 6);
ITEM_LENGTH_MAP.put(197, 6);
ITEM_LENGTH_MAP.put(204, 5);
ITEM_LENGTH_MAP.put(253, 8);
ITEM_LENGTH_MAP.put(254, 8);
ITEM_LENGTH_MAP.put(255, 8);
}
private BitSet bits;
public static int getItemLength(int id) {
Integer length = ITEM_LENGTH_MAP.get(id);
if (length == null) {
throw new IllegalArgumentException(String.format("Unknown item: %d", id));
}
return length;
}
public BitSet getBits() {
return bits;
}
private void sendResponse(
Channel channel, SocketAddress remoteAddress, int receiver, int sender, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeCharSequence("@NTC", StandardCharsets.US_ASCII);
response.writeIntLE(sender);
response.writeIntLE(receiver);
response.writeShortLE(content.readableBytes());
response.writeByte(Checksum.xor(content.nioBuffer()));
response.writeByte(Checksum.xor(response.nioBuffer()));
response.writeBytes(content);
content.release();
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
if (buf.getByte(buf.readerIndex()) == '@') {
buf.skipBytes(4); // preamble
int receiver = buf.readIntLE();
int sender = buf.readIntLE();
int length = buf.readUnsignedShortLE();
buf.readUnsignedByte(); // data checksum
buf.readUnsignedByte(); // header checksum
String type = buf.toString(buf.readerIndex(), 6, StandardCharsets.US_ASCII);
if (type.startsWith("*>S")) {
String sentence = buf.readCharSequence(length, StandardCharsets.US_ASCII).toString();
getDeviceSession(channel, remoteAddress, sentence.substring(4));
ByteBuf payload = Unpooled.copiedBuffer("*<S", StandardCharsets.US_ASCII);
sendResponse(channel, remoteAddress, receiver, sender, payload);
} else if (type.startsWith("*>FLEX")) {
buf.skipBytes(6);
ByteBuf payload = Unpooled.buffer();
payload.writeCharSequence("*<FLEX", StandardCharsets.US_ASCII);
payload.writeByte(buf.readUnsignedByte()); // protocol
payload.writeByte(buf.readUnsignedByte()); // protocol version
payload.writeByte(buf.readUnsignedByte()); // struct version
int bitCount = buf.readUnsignedByte();
bits = new BitSet((bitCount + 7) / 8);
int currentByte = 0;
for (int i = 0; i < bitCount; i++) {
if (i % 8 == 0) {
currentByte = buf.readUnsignedByte();
}
bits.set(i, BitUtil.check(currentByte, 7 - i % 8));
}
sendResponse(channel, remoteAddress, receiver, sender, payload);
}
} else {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
String type = buf.readCharSequence(2, StandardCharsets.US_ASCII).toString();
if (type.equals("~A")) {
int count = buf.readUnsignedByte();
List<Position> positions = new LinkedList<>();
for (int i = 0; i < count; i++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
for (int j = 0; j < bits.length(); j++) {
if (bits.get(j)) {
int value;
switch (j + 1) {
case 1:
position.set(Position.KEY_INDEX, buf.readUnsignedIntLE());
break;
case 2:
position.set(Position.KEY_EVENT, buf.readUnsignedShortLE());
break;
case 3:
position.setDeviceTime(new Date(buf.readUnsignedIntLE() * 1000));
break;
case 8:
value = buf.readUnsignedByte();
position.setValid(BitUtil.check(value, 1));
position.set(Position.KEY_SATELLITES, BitUtil.from(value, 2));
break;
case 9:
position.setFixTime(new Date(buf.readUnsignedIntLE() * 1000));
break;
case 10:
position.setLatitude(buf.readIntLE() * 0.0001 / 60);
break;
case 11:
position.setLongitude(buf.readIntLE() * 0.0001 / 60);
break;
case 12:
position.setAltitude(buf.readIntLE() * 0.1);
break;
case 13:
position.setSpeed(UnitsConverter.knotsFromKph(buf.readFloatLE()));
break;
case 14:
position.setCourse(buf.readUnsignedShortLE());
break;
case 15:
position.set(Position.KEY_ODOMETER, buf.readFloatLE());
break;
case 19:
position.set(Position.KEY_POWER, buf.readShortLE() * 0.001);
break;
case 20:
position.set(Position.KEY_BATTERY, buf.readShortLE() * 0.001);
break;
case 21:
case 22:
case 23:
case 24:
case 25:
case 26:
position.set(Position.PREFIX_ADC + (j + 2 - 21), buf.readUnsignedShortLE() * 0.001);
break;
case 29:
value = buf.readUnsignedByte();
for (int k = 0; k <= 7; k++) {
position.set(Position.PREFIX_IN + (k + 1), BitUtil.check(value, k));
}
break;
case 31:
value = buf.readUnsignedByte();
for (int k = 0; k <= 3; k++) {
position.set(Position.PREFIX_OUT + (k + 1), BitUtil.check(value, k));
}
break;
case 33:
case 34:
position.set(Position.PREFIX_COUNT + (j + 2 - 33), buf.readUnsignedIntLE());
break;
case 35:
case 36:
position.set("freq" + (j + 2 - 35), buf.readUnsignedShortLE());
break;
case 37:
position.set(Position.KEY_HOURS, buf.readUnsignedIntLE());
break;
case 38:
case 39:
case 40:
case 41:
case 42:
case 43:
value = buf.readUnsignedShortLE();
position.set("fuel" + (j + 2 - 38), (value < 65500) ? value : null);
break;
case 44:
value = buf.readUnsignedShortLE();
position.set(Position.KEY_FUEL_LEVEL, (value < 65500) ? value : null);
break;
case 45:
case 46:
case 47:
case 48:
case 49:
case 50:
case 51:
case 52:
value = buf.readByte();
position.set(
Position.PREFIX_TEMP + (j + 2 - 45),
(value != (byte) 0x80) ? value : null);
break;
case 78:
case 79:
case 80:
case 81:
case 82:
case 83:
position.set("fuelTemp" + (j + 2 - 78), (int) buf.readByte());
break;
default:
buf.skipBytes(getItemLength(j + 1));
break;
}
}
}
if (position.getFixTime() == null) {
getLastLocation(position, position.getDeviceTime());
}
positions.add(position);
}
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeCharSequence(type, StandardCharsets.US_ASCII);
response.writeByte(count);
response.writeByte(Checksum.crc8(Checksum.CRC8_EGTS, response.nioBuffer()));
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return positions;
}
}
return null;
}
}
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